## A Treatise on Refrigerating and Ice-making Machinery ... |

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A₁ absolute temperature abstracted ammonia angle Average base body brine capacity characteristic clearance coil column compression compressor condenser constant cooling corresponding Cosine Sine Cosine Cotang Tang Cotang cubic feet cubic foot cylinder decimal delivered denote difference divided effect efficiency ENGINE equals expansion expressed fall figures final Find following formula foot-pounds force formula given gives greater headed horsepower Iron latent heat leaving length less liquid logarithm machine mantissa means minute multiplied necessary obtain p₁ P₂ pipe piston pounds per square pressure Q₁ quantity ratio refrigeration required respectively result root RULES seconds Sine Cosine Sine space Specific Gravity specific heat square inch steam stroke surface t₁ taken Tang Cotang Tang temperature theoretical tons triangle V₁ vapor velocity volume W₁s weight wort ΙΟ

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Page 63 - W= weight of body at the surface; w = weight of a body at a given distance above or below the surface ; d= distance between the center of the earth and the center of the body ; R = radius of the earth = 4,000 miles.

Page 61 - To Divide One Number by Another, Subtract the logarithm of the divisor from the logarithm of the dividend, and obtain the antilogarithm of the difference.

Page 59 - X 10") - 3.8156. If the number is less than 1, the characteristic is negative and is numerically one greater than the number of zeros immediately following the decimal point. To avoid having a negative integral part and a positive decimal part, the characteristic is written as a difference.

Page 59 - For a number wholly decimal, the characteristic is negative, and is numerically one greater than the number of ciphers between the decimal point and the first digit of the decimal.

Page 66 - Law. — The temperature remaining the same, the volume of a given quantity of gas varies inversely as the pressure.

Page 59 - Law of Sines — In any triangle, the sides are proportional to the sines of the opposite angles. That is, sin A = sin B...

Page 61 - Multiply the logarithm of the number by the exponent which denotes the power to which the number is to be raised, and the result will be the logarithm of the required power. EXAMPLE. — What is the square of (a) 7.92 ? (6) the cube of 94.7? (<-) the 1.6 power of 512. that is, 5121-* ? SOLUTION.— (a) Log 7.92 = .89873; the exponent of the power is 2.

Page 24 - I .57381 .81899 .58802 .80885 .60205 .79846 .6.589 .78783 .62955 .77696 59 2 .57405 .81882 .58826 .80867 .60228 .79829 .61612 •78765 .62977 .77678 58 3 .57429 .81865 .58849 .80850 .60251 .79811 .61635 •78747 .63000 .77660 57...

Page 20 - ... •93979 I 60 .27564 .96126 •29237 •95630 .30902 .95106 .32557 .94552 .34202 •93969 0 / Cosine Sine Cosine Sine Cosine Sine Cosine Sine Cosine Sine...

Page 77 - ... however, it is more convenient to reject the air into the cooler D and draw the fresh supply from the atmosphere, which has a much higher temperature. In this case, it is evident that the air does not return to its original state in the cooler, and the cycle is not closed. 1345. General Theory. — In the following discussion, it will be assumed, for the sake of simplicity, that compression and expansion are adiabatic and that the air is drawn into the compressor from the cooling chamber, so...